Formula: AlCa2(SO4)2F2Cl.4H2O
Origin of name: for V.I. Vlodavets (1893-1993), Russian volcanologist
Crystal system: Tetragonal
Crystal class: 4/m
Twinning:
Unit cell: a = 6.856, c = 13.325
Colour: Colourless, yellow white
Diaphaneity: Transparent to semitransparent
Luster: Vitreous
Habit: As flakes, tablets and plates 0.1 to 0.3 mm across forming plastic coating (resembling wet clay) in open fractures, commonly fine-grained massive
Hardness:
Specific gravity: 2.10 to 2.35
Cleavage: 1; {100} perfect
Tenacity: Brittle, plastic in masses
Streak: White
Synonyms/varieties:
Comments: readily soluble in acids
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